Automatic rewind mechanism for motors



w. KABBELJ AUTOMATIC REWIND MECHANISM FOR MOTORS.

APPLICATION FILED FEB: 1 0, 1921- i 1 ,425, 8 6 3 Patented Aug 15, 1922.

2 SHEETS-SHEET I- 9 @Lil m W.

, I I 7 v fl g WaWXW M William Kahh E'L w. KABBEL.

AUTOMATIC REWIND MECHANISM .FOR MOTORS. I

' APPLICATION FILED FEB. 10. 1921.

1,425,863, Patented Aug.-15, 1922'.

2 SHEETSS HEET 2.

F I 6; WITLiaIn Kahhel WILLIAM KAB BEI", or ivrrnwnunnng w isoonsrn.

AUTOMATIC REWIND MECHANISM FOR MOTORS.

releases.

Specification of Letters Patent. Patgniefl Aura. 15 ggy Application filed Februaryw, 1921. Serial No. 443,937.

To all whom it may concern:

Be it known that I, W'ILLIAM KABBEL, a citizen of the United States, and resident of Milwaukee, in the county of Milwaukee and State of lVisconsin, have invented certain new and useful Improvements in Automatic Rewind Mechanism for Motors; and I do hereby declare that the following is a full, clear, and exact description thereof.

My invention refers to means for automatically rewinding the spring motors or the-like for musical instruments, clocks, or analogous motor driven devices. The object of my invention as to provide a simple, economical and effective electric motor attachment to the winding shaft of a prime motor, whereby the prime motor may be rcwound automatically by closing and opening a switch for controlling the current to the electric motor.

Another object of my invention is to provide in combination with the rewind mechanism, means whereby the prime motor can be wound either automatically or manually without interfering with the attachment.

Another object of my invention is to provide the electric driven motor shaft with a spring opposed slidable worm adapted to operate a oneway gear wheel which is in clutch connection with the prime motor shaft, whereby the prime motor shaft can be either revolved by the electric motor through the worm, or it can be operated in the same direction for rewinding by coupling a manual crank to the rewind shaft.

lVith the above, and other minor objects in view, the invention consists in certain peculiarities of construction and combination of parts, as are hereinafter set forth with reference to the accompanying drawings and subsequently claimed.

In the drawings:

Figure 1 represents a side elevation of a rewind mechanism attachment embodying the features of my invention, certain of the parts being in section as indicated by line l,1 of Figure 2.

Figure 2 is a plan view of the same showing the rewind mechanism permanently attached to the inner wall of a musical instrument or phonograph.

Figure 3 is a side elevation of the device, with parts removed and parts in section, as indicated by line 2-2 of Figure l.

Figures 1 and 5 are detail cross sections of the samefthe sections being indicated respectidyely by lines 44L and 5-5 of Figure Figure 6 is a fragmentary detail sectional view of a part of the shiftable electric contact make and break mechanism, the section being indicated by line 66 of Figure 5.

Eeferring bycharacters to the drawings, A represents an electric motor having a split shell B extendmg'from its front portion and encasing the electric motor shaft 1, which shaft is jou'rnaled in the-outer end of the shell, and is provided with an intermediate portion 1 that is polygonal in shape, as best shown in Figures 4 and 5. This polygonal or keyed portion 1 of the shaft has mounted thereon a worm 2, which is adapted to rotate with the shaft, but also has longitudinal motion thereon. The inner end of the worm is formed with a collar 2 and the outer end is engaged by one end of a coil spring 3, which coil spring surrounds the shaft and its opposite end is in abutting engagement with the inner wall of the shell '13",

it being understood, however, that the ends of the spring directly press against washers l 4', which are interposed between the shell and wall and the end of the worm.

The shell B is provided with a circular chamber B having transverse bearing apertures through which thewinding shaft C of the prime motor extends, it being understood that this motor is of the ordinarytype and forms no part of my invention, and is therefore notv shown. I-lowever,the prime motor is offthe spring type. The outer end of the prime motor shaft C is provided with v J the usual threaded coupling socket for engagement with the corresponding threaded end of a winding crank C, which winding crank extends through an aperture :in the wall of the musical instrument, asbest shown in Figures 2 and 4-.- Secured to the end of the windingshaft C is a bushing 5, the ends of which arejournaled in the shell apertures and serve to support and align the end of the shaft C. The bushing is formed with an annular shoulder constituting a. ratchet wheel 5', against which one face of a worm wheel 6 is arranged to abut, the worm wheel being loosely mounted upon the bushing and held against end play by spring. ring 7. The ratchet wheel 5 is of the one-way type, as best shown in Figure 3, and its notched teeth are engaged by pawls 8, which are pivoted to the juxtaposed face of the worm wheel.

As best shown in Figures 1, 2 and 5,'the

shell l and its circular portion B carry an electrical circuit make and break mechanism, which is adapted to open and close the electric circuit controlling the motor A. The make and break mechanism comprises a fixed contact finger 9 and an oscillatory contact finger 9, which finger is connected to a yoke 10 that carries adjustable contact points 11 11". These contact points are aligned in a path of travel of a tappet pin 12, which tappet pin is carried by a block 13 that is guided and arranged to slide in a longitudinally disposed aperture i l formed in one wall of the barrel portion B of the shell. The inner end of the block 13 is of thespanner type and is nested within the shell B, the spanner portion being grooved to engage the collar 2 of the wall 2.

l'ielel'l'lfig to higures i and 0, when the parts are in the position assumed in these two figures, the prime motor spring is unwound and the tappet pin 12, controlled by the worm is engaging the contact point 11, whereby the yoke is rocked upon its pivot to close the contact fingersl) and 9. In this position, the current is introduced into the motor A, and due toits rotation, it will cause the worm wheel to revolve in the direction of the arrow, whereby the winding shaft 6 is revolved and the associated prime motor spring will be wound, due to the fact that the on eway clutch mechanism comprising the ratchet wheel 5 and pawls 8, will turn the shaft 0.

This action of the shaft and worm wheel will continue until the tension upon the spring of the prime motor has reached a pre determined degree. Owing to the: spring tension thus exerted in a revised direction from that taken bythe worm wheel, the worm 12 will travel toward the outer end of the motor shaft slowly in opposition to the resistance of the coil spring 3, and when the spring tension upon the prime motor shaft is equalized by the tension of the compressed coil spring 3, the worm will have moved longitudinally of its shaft to approximately its full travel, this movement being permitted and limited by the length of the slot 14 of shell B. Hence, it will be seen that the block 18 and its tappet 12 will at messes this time have engaged the contact point 11 of the switch mechanism, whereby the yoke 10 will be again rocked. upon its pivot to separ: e the contact fingers and thus break the currentor motor circuit, whereby said motor will come to a stop, and the prime motor is thus rewou-nd. This action is re peated automatically when the prime motor spring requires rewinding, and the action is thereby intermittent.

In conditions where it is desired to tension the prime motor before it unwinds to a point where it will be rewound by the automatic mechanism, 1 provide means for coupling an ordinary hand crank C, as shown in Figure l, to the prime motor rewinding shaft C. Hence, it will be observed that this manually controlled crank can effectually rewind the prime motor, without disturbing the automatic rewind gear mechanism, due to the pawl and ratchet connection between the shaft C and the worm wheel 6.

I claim:

In a rewinding device for a prime motor having a winding shaft, provided with a coupling and a manually operated crank engageable with the coupling; the combination of a bushing secured to the winding shaft, a one-way ratchet wheel carried by the bushing, a worm wheel loosely mounted upon the bushing, pawls carried by the worm wheel engageable with the ratchet wheel, an electric motor having a keyed shaft extension, a worm mounted upon the shaft extension adapted to rotate with and to move longitudinally thereof a housing for the shaft extension provided with apertures constituting bearings for the bushing, a spring interposed between one end of the worm and housing to oppose movement of said worm in one direction, a tappet carried by he worm and an electric circuit make and break contact mechanism controlled by the tappet.

In testimony that I claim the foregoing I have hereunto set my' hand at Milwaukee, in the county of hililwaukee and State of Wisconsin.

WILLIAM KABBEL. 

